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RE: [femm] eddy-curr in a tube
Excellent
Presentation of the example. For the boundary conditions, is there a
theoretical justification to weight the interpolation values differently to
obtain a better answer using finite element. I have developed a FDTD model
for my PhD work and I come upon the exact same result you did. Since I was
modeled the B and H fields around a particular hysteresis loop it was critically
important to ensure that the boundary conditions were properly modeled. In
the interpolation of the grid I weighted the interior values more heavily than
the exterior values and obtained good results (a 1/3 2/3 rule seemed to work
best). Unfortunately I did not have the scope to explore the numerical
physics behind the choice of these weighting coefficients. Anyway, I find
that your model does a really great job. Any plans to incorporate
hysteresis effects.
Bruce
In a
message dated 4/4/01 10:01:28 AM Eastern Daylight Time,
rlbrambilla@xxxxxxx writes:
Hi, femm-friends
I have a tube of finite length=2L,
inner-radius=b,
outer radius=a, relative mag. perm.=mur,
el.
conductivity=sigma.
An infinite alternating current line
Io.exp(jwt) is positioned
(1) on the axis of the tube;
(2)
parallel to the axis, out at a distance.
Do you know if any
analytical
solutions for eddy currents in the tube exist to compare with
FEMM analysis?
Thank you in advance Roberto.
Roberto Brambilla
CESI
Via Rubattino 54
20134 Milano
tel +39.2.2125.5875
fax
+39.2.2125.610
rlbrambilla@xxxxxxx
This
seemed like it might make an interesting test case. I figured out an
analytical solution for the case where you have a wire carrying AC running
down the bore of a finite length steel tube and compared it to femm's
solution of the same problem. I think this is the same as your case
(1).
Check out:
http://members.aol.com/_ht_a/gmagnetics/tube/tube.htm
David Meeker
--
http://members.aol.com/_ht_a/dcm3c
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